Adjust screen brightness in Mac OS X app

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There’s no such nice API for doing this on OS X.

We have to use IOServiceGetMatchingServices to find "IODisplayConnect" (the display device) then use the kIODisplayBrightnessKey to set the brightness:

func setBrightnessLevel(level: Float) {

    var iterator: io_iterator_t = 0

    if IOServiceGetMatchingServices(kIOMasterPortDefault, IOServiceMatching("IODisplayConnect"), &iterator) == kIOReturnSuccess {

        var service: io_object_t = 1

        while service != 0 {

            service = IOIteratorNext(iterator)
            IODisplaySetFloatParameter(service, 0, kIODisplayBrightnessKey, level)
            IOObjectRelease(service)

        }

    }
}

setBrightnessLevel(0.5)

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